78686423682902 has 32 divisors (see below), whose sum is σ = 135000722304000. Its totient is φ = 33695327049120.

The previous prime is 78686423682887. The next prime is 78686423682947. The reversal of 78686423682902 is 20928632468687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1108239599 + ... + 1108310597.

It is an arithmetic number, because the mean of its divisors is an integer number (4218772572000).

Almost surely, 2^{78686423682902} is an apocalyptic number.

78686423682902 is a deficient number, since it is larger than the sum of its proper divisors (56314298621098).

78686423682902 is a wasteful number, since it uses less digits than its factorization.

78686423682902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134276.

The product of its (nonzero) digits is 668860416, while the sum is 71.

The spelling of 78686423682902 in words is "seventy-eight trillion, six hundred eighty-six billion, four hundred twenty-three million, six hundred eighty-two thousand, nine hundred two".